Motorola Corporation

Google Inc.

Motorola Mobility LLC

Lawrence R Schumacher

Thomas D Nagode

Dean E Thorson

Don R Holcomb, Sr

Mark J Brown

William Paul Alberth, Jr

Gregory Redmond Black

Ryan Joseph Goedken

Brian Hans Bremer

Jeremy A Jacobson

Vimalkaushik Natarajan

Thomas Jake Hoppal

Ernie Schirmann

A method and apparatus can cut back power in a simultaneous dual frequency band call. The method may operate a dual frequency band transmit device. The method may include determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device. The method may include determining if the transmit power in the first frequency band is above a threshold power. The method may include reducing maximum transmit power in the second frequency band by an amount proportional to transmit power in the first frequency band and transmit signal bandwidth in the second frequency band in only the portion of the second frequency band where a resultant frequency component can cause desensitization.

Method and apparatus for power cutback in a simultaneous dual frequency band call

A communication device reduces intermodulation interference in a simultaneous transmitter using a notch diplexing arrangement. The communication device has a radio front-end module with more than one transceiver for simultaneous transmission with opposing transmit (Tx) band notch filters in series with each duplexer output, and phase rotations into and out of the notch filters suitable for diplexing at the notch filter outputs.

Communication device for simultaneous transmission by multiple transceivers

A device () for reducing vibration effects on position measurement includes a receiver () for providing position signals (); and a vibration control circuit () operative to control position information generation based on the position signals (), to prevent position information generation during mechanical vibration of the device (). A method for reducing vibration effects on position measurement includes receiving position signals through a receiver; and controlling position information generation based on the position signals to prevent the position information generation during mechanical vibration of the device.

Device and method for reducing vibration effects on position measurement

A method in an amplifier, for example, a power amplifier in a wireless transmitter, including monitoring () a characteristic of the amplifier during a first active interval of the first set of active intervals, storing () the amplifier characteristic monitored during the first active interval of the first set of active intervals, correcting () an open-loop control signal to the amplifier based on the stored amplifier characteristic monitored during the first active interval of the first set of active intervals, and providing () the corrected control signal during a second active interval of the set of first active intervals subsequent to the first active interval of the set of first active intervals.

Amplifier power control in frequency hopping applications and methods

A method for reducing current drain in a communication device includes a step of determining when the communication device is transmitting. A next step includes lowering the current level to the receiver when communication device is not transmitting. A next step includes raising the current level to the receiver when communication device is transmitting. Changing the current level alters the linearity of the receiver. As a result, the communication device reduces power consumption while operating in a traffic channel. The system is applicable to full duplex systems such as code division multiple access (CDMA) systems.

Current reduction by receiver linearity adjustment in a communication device

A directional coupler (103) for radio equipment couples a radio frequency signal from an input of a microstrip transmission line (309) to an output and provides a directionally coupled output via a stripline microstrip (311). Open circuit microstrip transmission line stubs (313 and 315) are tuned to a quarter wavelength of the third harmonic of the radio frequency to provide third harmonic rejection within the directional coupler.

Radio equipment directional coupler

Microprocessor (MPU) controlled voltage controlled oscillator (VCO) linearization circuitry locks the VCO at desired low, center and high frequencies (F.sub.1, F.sub.c and F.sub.h) and measures the magnitudes of the corresponding control voltages (V.sub.1, V.sub.c and V.sub.h). Next, the VCO is swept at a nominal clock frequency to determine the times (T.sub.1, T.sub.2 and T.sub.h) that the control voltages (V.sub.1, V.sub.c and V.sub.h) occur during the sweep cycle. The control voltage of the VCO is then swept at a first and then a second rate during a sweep cycle to assure that the center frequency (F.sub.c) of the VCO occurs at the time (T.sub.c) midpoint of the sweep cycle. As a result, each VCO frequency can be determined by MPU monitoring according to the time that the VCO frequency occurs during the sweep cycle. This circuitry is useful in spectrum analyzers for indirectly determining the otherwise unknown frequency of a received signal.

Sweep generator linearization system and method

An additional mixer is included in the feedback loop of a PLL which can be one of the local oscillators of a dual conversion system. A fine tuning frequency synthesizer is coupled to an input of the additional mixer for providing fine frequency control of the PLL. The fine tuning frequency synthesizer can include an additional phase locked loop. Also, a feedback signal for suppressing noise created by another local oscillator can also be applied to the additional mixer.

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Hoffman Estates, IL, United States of America

Lawrence R Schumacher